Apoptosis occurs when ___________________.
a. cancer cells become invasive and grow into a body tissue
b. sickled red blood cells block capillaries and then are cleared by the body
c. mitochondria take in oxygen and sugar in a complex cellular process
d. cells that are supposed to die undergo a programmed cell death as in a tadpole's tail

Respuesta :

The answer would be a. cancer cells become invasive and grow into a body tissue. Apoptosis is a programmed cell death that certain cells undergo in order to protect the organism. However, sometimes these cells can avoid apoptosis and do not respond to signals to stop dividing (known as uncontrolled cell division); this results in a mass of extra cells (tumor) and that's how cancer happens. Hope this made sense :)